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  1. Just received the new B&C 12CL64. Unfortunately,...

    Just received the new B&C 12CL64. Unfortunately, it is not an exact match. The magnet is slightly smaller and it sounds smaller as well. Not as deep and not quite as efficient/loud in the same cab....
  2. Nothing is certain but Leo's friend Al from...

    Nothing is certain but Leo's friend Al from usspeaker.com plugged in the cabinet dimensions from the Markbass combo into his modelling program and concluded that the B&C 12CL64 is the closest match...
  3. Hey Juan, I gave the exact model # of the...

    Hey Juan, I gave the exact model # of the original markbass driver and a suspected B&C replacement. Please read my original post. I'm asking if anyone can confirm that this is indeed the same or very...
  4. Thanks Leo, I caught him just before he took off...

    Thanks Leo, I caught him just before he took off for vacation. Very helpful!
  5. Markbass Combo II mini CMD 121 P blown speaker

    Hey techs,
    Anyone have experience replacing the neo 12" speaker in this combo? I know that its made by B&C. I've contacted VST which is the exclusive Markbass distributor and warranty service center...
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    Today that tube and all others seem fine. No...

    Today that tube and all others seem fine. No arcing in any socket. I had already cleaned and retensioned before testing. All tubes measure between 25-29ma at idle when set just below red LED...
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    Thanks! Im guessing this is normal for 6, 6550s....

    Thanks! Im guessing this is normal for 6, 6550s. If anything else was drawing that much current, there would be heat. I didn't smell or feel anything unusual so far and there was no excessive ripple...
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    Very little current draw in standby. Will take...

    Very little current draw in standby. Will take measurements tomorrow. Thanks for your calculations!
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    Any experience with this model or similar 300W...

    Any experience with this model or similar 300W tube amp to know normal idle current? 2.5A seems high to me but I dont have another to compare.
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    Thanks!

    Thanks!
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    Chuck H, as Enzo explained, it's just a ferrite...

    Chuck H, as Enzo explained, it's just a ferrite bead designated L1-L6 on the SLM era SVT Classic schematic. I dont know how to attach the schematic with my phone. Will try tomorrow when I'm back at...
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    The PI tubes are good and in correct sockets....

    The PI tubes are good and in correct sockets. I've worked on many of these amps but have never seen an inductor/ferrite bead fail. Not sure why they had been removed but since they are in series with...
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    SVT Classic Power amp issues

    Hey Guys,

    I just inherited a repair from another tech. Its been sitting for quite a while after a failed attempt to repair. Original problem was that it would not come out of standby(like all SVT...
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    Thanks g1, but I think that was if I was using...

    Thanks g1, but I think that was if I was using the stock choke and 5E8-A circuit. Since I have wired the power supply as per the 5F8-A, idle current should not be an issue as I am using new...
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    I should have mentioned that I did add the 470...

    I should have mentioned that I did add the 470 ohm screen resistors and also added a bias trim pot with plenty of range to accommodate NOS and new production tubes.
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    Wow, I see that now! Since I wired it like the...

    Wow, I see that now! Since I wired it like the 5F8-A with the B+ before the choke, I don't need that large choke but now I'm curious to hear the difference...
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    Thanks everyone! This gives me lots to think...

    Thanks everyone! This gives me lots to think about. I am not an engineer but I do know ohms law and have been servicing and building amps for several decades now. This is the first request that I've...
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    Enzo, It's unusual for fender but not for other...

    Enzo, It's unusual for fender but not for other early tube amps. But this is a perfect example for my original question as the later model 5F8-A uses a single 5AR4, not 2x 5U5GB as in the 5E8-A. Does...
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    Yes, I know that smaller caps are/were cheaper...

    Yes, I know that smaller caps are/were cheaper but Fender made plenty of amps before and after this model with 2x 20uf for a 1st filter stage. I am aware that smaller caps are used down the line in...
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    Dual rectifiers and filter cap limits

    Hey guys, I'm new around here, or new again as I lost my password and couldn't access my old email address.

    I build and repair amps and have just finished a 5E8-A low power tweed twin build for a...
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